Spark arrester frame for locomotives



March 30, 1948.

B. H. PEDIGO SPARK ARRESTER FRAME FOR LOCOMOTIVES Filed Feb. 16, 1945 3 Sheetsr- Sheet 2 a ,BHPeaZz'go March 30, 1948. pE 2,438,862

SPARK ARRESTER FRAME FOR LOCOMOTIVES Filed Feb. 16, 1945 5 Sheets-Sheet 3 awe/Wm Patented Mar. 30, 1948 SPARK ARRESTER FRAME FOR LOCOMOTIVES Benjamin H. Pedigo, Jackson, Tenn.

Application February 16, 1945, Serial No. 578,222

Claims. (01. 110122) This invention relates to spark arresters for boilers and particularly locomotive boilers, and is an improvement over the construction embodied in my prior Patent No. 1,652,580 dated December 13, 1927, for Netting door for locomotive smoke boxes.

An object ofthis invention is to provide an improved netting or screen for holding the sparks and hot cinders'from being discharged through the stack.

Another object of this invention is to provide a netting or screen of this character which is selfcleaning.

A further object of this invention is to provide a netting or screen of this kind which includes removable panels with each panel formed of a' pair of screens so that a selected screen section may be easily removed for replacement or the like.

A further object of this invention is to provide an improved means for locking the removable panels or frames to the stationary supporting frame, so that the removable panels will be held claimed.

In the drawings:

Figure 1 is a fragmentary vertical sectional view taken longitudinally through a locomotive boiler having a spark arrester mounted therein,

constructed according to an embodiment of this.

invention.

Figure 2 is a sectional view taken on the line 2--2 of Figure 1.

Figure 3 is a fragmentary sectional view similar to Figure 2 with the screen frames removed.

Figure 4 is a sectional view taken on the line 4-4 of Figure 1 or Figure 2.

Figure 5 is a fragmentary sectional view taken on the line 55 of Figure 2.

Figure 6 is a fragmentary sectional View taken on the line 6-6 of Figure 2.

Figure '7 is a fragmentary sectional View taken on the line 1-l of Figure 2.

Figure 8 is a fragmentary sectional view taken on the line 8--8 of Figure 2.

Figure 9 is a fragmentary sectional view taken on the line 9-9 of Figure 4.

Figure 10 is a fragmentary plan view of the nozzle and the frame supporting structure mounted thereon.

Referring to the drawings, the numeral l5 designates generally a cylindrical boiler designed for a locomotive, which is provided with a nozzle l6 and a smoke stack l'l above the nozzle it, which is formed with a flared lower intake end [8.

The boiler l5 includes a smoke box l9, and in order to provide a means whereby the sparks entering the smoke box 19 will be prevented from passing upwardly through the flared intake l8 and the smoke box I1, I have provided a removable screen structure which includes outer side screen members 20 and 2| and intermediate or central screen or door structure 22. The screens 23, 2| and 22 are removably mounted on a stationary frame structure which is secured within the boiler l0 and includes oppositely disposed longitudinally curved bars 23 and 24 which are welded to the inner side of the boiler [5. The boiler l5 includes a bafile, or dead plate, 81 of conventional design and location, so located to direct the smoke and gases to the outer and central screen structures 2|], 2 I, and 22.

An upper plate 25 is disposed above the upper ends of the outer side bars 23 and 24, being disposed in a vertical position, whereas the frame bars 23 and 24 are disposed on a downward and inward inclination. A horizontally extending bar 26 is formed integral with the plate 25, being bent inwardly on the same angle as the inclination of the frame bars 23 and 24. The frame bar 23 is provided with a plurality of elongated openings 21 positioned inwardly from the outer edge thereof, and the frame bar 24 is formed with a plurality of elongated openings or keepers 28, positioned inwardly from the outer edge thereof. A lower horizontally disposed frame bar 29 is disposed across the lower portion of the boiler l5 and terminates at the opposite ends thereof at the inner edges of the side frame bars 23 and 24.

The opposite ends of the frame bar 2 9 are free from the outer side bars 23 and 24, so that when desired the lower frame bar 29 may be removed. The frame bar 29 is secured, as by welding or the like, to a supporting ring 30, which engages over the tapered upper end 3| of the nozzle 13. The lower frame bar 29 has projecting forwardly and downwardly therefrom lugs 32, 33 and 34, the purpose for which will be hereinafter described.

The lug 32 has secured thereto an upwardly and forwardly projecting pin 35, and the lug 33 has secured thereto an upwardly and forwardly projecting pin 36. The lug 34 has projecting therefrom an upwardly and forwardly extending pin 31, and the latter is formed, as shown in Figure 9, with a transverse opening 38. The side screen frame 20 comprises a lower frame bar 39, which is adapted to engage against the forward side of the lower frame bar 29 and the screen structure 29 also includes an outer longitudinally arcuate frame bar at disposed in confronting position to side frame member 23. The screen structure 120 also 'iricludes an'inn'er frame bar ll and an'up'perframe bar 42. The frame'bars 39, W, 4i and 42 are secured together in any suitable manner, as by welding, or the like, and an angularly disposed bracing bar 43 is-secured -between the frame bars 48 and 4| and is formed with a plurality of openings 44 through which the smoke and gases are adapted to pass; "A'wire screen 45 is secured to the inner side of the frame structure formed by the bars 39. 46. 4| and42 by means of bolts or other fastening devices '46; In

this manner the screen 35 may be taken off from the frame when this screen becomes damaged-or burnt in any portion thereof.

In order to'providefor supporting and locking the screen structure 26 to the boiler; I have provi'ded a plurality of substantially L-shapedlugs 5?, which are carried by the-outer frame member st, and are adapted to extend into the openings iii'ofside frame member 23. The lugs 41 are formed'with downwardly directed bills #8, soas to firmly lock the screenframe structure with-respecttothe-side frame bars-23. Theslots 27 are of sufficient length to permit the free passage-of the looking and supporting members il therethrough.

Theupper framebar 26 has secured thereto a screen'frame-supporting hookts, which is similar tothe construction'shown in Figure 6. There 'is one hook'for eachof the screen frames and these hooks are of like construction. These hooks are formed of an upwardly bent or substantially L-shaped hook it, which is formed with one or more stepped portions sit-with which the upper frame bar 132 is adapted to engage, the latter :being formed with a slot 5i for passage of the hook 39.

- The lower'end of'the screenframe structure 20 is provided-with a forwardly and downwardly ex tending lug having an opening '53- through which the pin 351s adapted to extend. Ihe inner frame t! has extending forwardly therefrom a plurality cfzspaced-ap'art upwardly directed and substantially L -shaped locking members 54; which are adaptedto engage through-slots 55=formed in the adjacent side bar as of the-centralscreen structure "or door .22. The central screen structure -or-dor 122' is of rectangular configuration and includes opposite side "bars 56 and el 'and upper and lower bars 58 and 59. A V-shapedbracing member iidwhichis formed with openings 6l=,=is secured between the opposite side bars fiii 'and 51. Thelower bar-59 is provided with a forwardly and down'wardly extending lug- 52, having anwopen'i'ng es-throughwhich the pin 3121s adapted-to-engage, and a lockingwedge orbolt 64 engages through the slot 33 and bears againstthe upper side-of lug 62 so as to -firmly lock the 'c'entral door withrcspect to the lower frame bar 29.

A chain this secured:at-one--end tothe wedge er key 64 and is secured at the opposite thereoftothe lower end of pin 3T so'that the -key 'will not be lost when it' has beenwithdrawngorin the event it should accidentallybecome disen agea rrem the'iopening 38 in-pin 33?.

I The upper-framebar es'i's provided with a slot 'or opening fie'through which"the'supporting-shook is for'm'ed withi-a plurality of "downwardly di- '*rcted'andsubstantially L shaped hdOks'lZ which engage through the slots 28 for locking the frame structure formed by the bars 61, 68, 69 and 10, relative-to-theboiler l5.

"li he upper'bar 68 is formed with an elongated slot i2a for receiving the supporting hook 49 assoc-iated wi-ththis outer side frame and the inner I frame-bar llibhas projecting forwardly therefrom a plurality of upwardly directed center door supporting hooks 13, which are similar to the hooks 54 shown in Figure 8. The center door side bar 51 is formed-with a plurality of slots 14; through which thesupporting-hooks-l 3- are-adaptedto en'- gage; and as will be'noted from Figure 2,--the--side bars 5 5 and 5 l' of theeenter-door overlap-theadjacent side-bars: 44- and 1 0; respectively; n of the side screen structure.

With a construction-as hereinbefore described, theside screen structures cannotbe removed until thecenter door-or screen structureahas been removed. The center door frame structure-includes a wire-screen 'l' 5- secured to --the inner side of .1 the frame structure by 7 bolts =16, o-r -the like, and the side frame structure 2! includes a wire screen 11 secured -to the-frame structure thereof by belts or other suitable fasteningme-mbers 18.

In the use of this spark-arrester 'structure the stationary --frame-- members 23,- 24 and" 25 are welded; or otherwise-firmly secured to the-inner side of the-boiler wall and the lower frame member which is a removable-frame member is mounted on-t-he-upper end-of the-nozzleby means of -the-supporting ring 30; -The outer screen structures 20 and 2! are initially-inserted by- -engaging-the astructureswiththe zhOOkS '49, carriedby-the frame-bar ZGTandengagingthe l-ug '52 ofscreen structure-zli withpinefi.

- T Screen-structure :21- has -projectinga forwardly and downwardlytheref-rom-a 1 lug- 1 9, having-an opening Bil- =throu-gh which the-pin at ia-adapted to engage. The center door may; then beengaged with the upwardlydirected hooks 54 and{13,. and also engage with the associated upper hook 19, which extends through the slotfE-of-npper frame bar- :58-and lug-2 is-extended" overpin -31. Key 64istheninserted-inkeeperslots'i8.

--l. -In-a ccm entional locomotive boiler having a firebox and a smoke box, means communicating with-- the 1 firebox through itsrearwall and" with said smoke box for directing the smoke from the firebox to saidsmoke box; asmokestack extending through the top w-all ofisaidsmoke-box axriozzle through the bottom of said smokebox-aligning with the Smokestack, and a baiiie secured'ht its-top edge tothe top-orthe smokeboxwithin thesmokebox between the stack ianderibz'zldand thewpoint :at"-"whicli'--=the-:smoke directing-means momma-nicates with the smoke boxg the side-walls of= said baiiie being.secured to'the sidewalls of thersmbkebox extending downwardly-and: forwardly :from sa-id topedge to a point forwardly of the-"nozzle, said bafiie surrounding thdffohale and flraving its free-edge*spanedabove the of the smokebox whereby to providea passagewayfoi the gases of ccmbustion tnerebeneatlr a nd up around-said free edge to the stack, a spark arresting means comprising a stationary screen supporting frame disposed in said smokebox, said frame comprising an upper bar fixed within the smokebox to the top thereof forwardly of the stack and nozzle transversely of the smokebox, a pair of opposed side bars extending downwardly from said first bar in contact with the sides of the smokebox to the free edge of the baffle, said side bars being formed with spaced apart elongated slots, a lower horizontal bar extending between the lower ends of said side bars and connected to said free edge of the baffle, means removably supporting said lower bar from said nozzle, screens across the space between the bars and the free edge of the baflie, said screens comprising opposite side screen members,

outwardly extending hooks relative to one face,

of the side screens carried by the outer portions of said side screen members and engageable in said slots for detachably securing said side screen members to said frame, outwardly extending hooks relative to the other face of the side screens carried by the inner portions of said side screen members, and said screens also comprising a central screen member formed with spaced slots in the opposite side portions thereof for receiving said upwardly directed hooks to thereby detachably secure said central screen member to said side screen member.

2. A spark arrester as set forth in claim 1, including apertured bracing bars carried by said side and central screen members.

3. A spark arrester as set forth in claim 1, including correlated means carried by said lower frame bar and said side and central screen members for detachably securing said screen members to said lower frame bar.

4. A spark arrester as set forth in claim 1, including outwardly extending hooks relative to one face of said upper frame bar carried by said frame bar, said screen members being formed with slots for receiving said latter hooks for detachably coupling said screen members to said upper bar.

5. A spark arrester as set forth in claim 1, wherein said lower bar supporting means includes a ring fixed to said lower bar and engaging about saidnozzle.

BENJAMIN H. PEDIGO.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,148,764 Faires Aug. 3, 1915 1,287,310 Herron Dec. 10, 1918 1,426,196 J ordahl Aug. 15, 1922 1,509,314 Powers Sept. 23, 1924 1,531,332 Boyler Mar. 31, 1925 1,652,580 Pedigo Dec. 13, 1927 

